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Change default of recovery_target_timeline to 'latest'

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This is what one usually wants for recovery and almost always wants
for a standby.

Discussion: https://www.postgresql.org/message-id/flat/6dd2c23a-4162-8469-410f-bfe146e28c0c@2ndquadrant.com/
Reviewed-by: David Steele <david@pgmasters.net>
Reviewed-by: Michael Paquier <michael@paquier.xyz>
This commit is contained in:
Peter Eisentraut 2019-01-11 10:36:10 +01:00
parent 373bda61d2
commit 0acb3bc33a
9 changed files with 15 additions and 37 deletions
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8
doc/src/sgml/config.sgml
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@ -3353,10 +3353,14 @@ restore_command = 'copy "C:\\server\\archivedir\\%f" "%p"' # Windows
Specifies recovering into a particular timeline. The value can be a
numeric timeline ID or a special value. The value
<literal>current</literal> recovers along the same timeline that was
current when the base backup was taken. That is the default. The
current when the base backup was taken. The
value <literal>latest</literal> recovers
to the latest timeline found in the archive, which is useful in
a standby server. Other than that you only need to set this parameter
a standby server. <literal>latest</literal> is the default.
</para>
<para>
You usually only need to set this parameter
in complex re-recovery situations, where you need to return to
a state that itself was reached after a point-in-time recovery.
See <xref linkend="backup-timelines"/> for discussion.

6
doc/src/sgml/high-availability.sgml
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@ -690,8 +690,8 @@ protocol to make nodes agree on a serializable transactional order.
<filename>standby.signal</filename> in the standby's cluster data
directory. Set <xref linkend="guc-restore-command"/> to a simple command to copy files from
the WAL archive. If you plan to have multiple standby servers for high
availability purposes, set <varname>recovery_target_timeline</varname> to
<literal>latest</literal>, to make the standby server follow the timeline change
availability purposes, make sure that <varname>recovery_target_timeline</varname> is set to
<literal>latest</literal> (the default), to make the standby server follow the timeline change
that occurs at failover to another standby.
</para>
@ -1024,7 +1024,7 @@ primary_slot_name = 'node_a_slot'
<para>
If an upstream standby server is promoted to become new master, downstream
servers will continue to stream from the new master if
<varname>recovery_target_timeline</varname> is set to <literal>'latest'</literal>.
<varname>recovery_target_timeline</varname> is set to <literal>'latest'</literal> (the default).
</para>
<para>

2
src/backend/access/transam/xlog.c
View File

@ -324,7 +324,7 @@ static bool recoveryStopAfter;
* file was created.) During a sequential scan we do not allow this value
* to decrease.
*/
RecoveryTargetTimeLineGoal recoveryTargetTimeLineGoal = RECOVERY_TARGET_TIMELINE_CONTROLFILE;
RecoveryTargetTimeLineGoal recoveryTargetTimeLineGoal = RECOVERY_TARGET_TIMELINE_LATEST;
TimeLineID recoveryTargetTLIRequested = 0;
TimeLineID recoveryTargetTLI = 0;
static List *expectedTLEs;

7
src/backend/utils/misc/guc.c
View File

@ -3387,7 +3387,7 @@ static struct config_string ConfigureNamesString[] =
NULL
},
&recovery_target_timeline_string,
"current",
"latest",
check_recovery_target_timeline, assign_recovery_target_timeline, NULL
},
@ -11028,7 +11028,7 @@ show_data_directory_mode(void)
static bool
check_recovery_target_timeline(char **newval, void **extra, GucSource source)
{
RecoveryTargetTimeLineGoal rttg = RECOVERY_TARGET_TIMELINE_CONTROLFILE;
RecoveryTargetTimeLineGoal rttg;
RecoveryTargetTimeLineGoal *myextra;
if (strcmp(*newval, "current") == 0)
@ -11037,6 +11037,8 @@ check_recovery_target_timeline(char **newval, void **extra, GucSource source)
rttg = RECOVERY_TARGET_TIMELINE_LATEST;
else
{
rttg = RECOVERY_TARGET_TIMELINE_NUMERIC;
errno = 0;
strtoul(*newval, NULL, 0);
if (errno == EINVAL || errno == ERANGE)
@ -11044,7 +11046,6 @@ check_recovery_target_timeline(char **newval, void **extra, GucSource source)
GUC_check_errdetail("recovery_target_timeline is not a valid number.");
return false;
}
rttg = RECOVERY_TARGET_TIMELINE_NUMERIC;
}
myextra = (RecoveryTargetTimeLineGoal *) guc_malloc(ERROR, sizeof(RecoveryTargetTimeLineGoal));

2
src/backend/utils/misc/postgresql.conf.sample
View File

@ -261,7 +261,7 @@
# just after the specified recovery target (on)
# just before the recovery target (off)
# (change requires restart)
#recovery_target_timeline = 'current' # 'current', 'latest', or timeline ID
#recovery_target_timeline = 'latest' # 'current', 'latest', or timeline ID
# (change requires restart)
#recovery_target_action = 'pause' # 'pause', 'promote', 'shutdown'
# (change requires restart)

2
src/bin/pg_rewind/RewindTest.pm
View File

@ -161,7 +161,6 @@ sub create_standby
$node_standby->append_conf(
"postgresql.conf", qq(
primary_conninfo='$connstr_master application_name=rewind_standby'
recovery_target_timeline='latest'
));
$node_standby->set_standby_mode();
@ -273,7 +272,6 @@ sub run_pg_rewind
$node_master->append_conf(
'postgresql.conf', qq(
primary_conninfo='port=$port_standby'
recovery_target_timeline='latest'
));
$node_master->set_standby_mode();

1
src/test/recovery/t/004_timeline_switch.pl
View File

@ -51,7 +51,6 @@ my $connstr_1 = $node_standby_1->connstr;
$node_standby_2->append_conf(
'postgresql.conf', qq(
primary_conninfo='$connstr_1 application_name=@{[$node_standby_2->name]}'
recovery_target_timeline='latest'
));
$node_standby_2->restart;

12
src/test/recovery/t/009_twophase.pl
View File

@ -229,10 +229,6 @@ is($psql_rc, '0', "Restore of prepared transaction on promoted standby");
# restart old master as new standby
$cur_standby->enable_streaming($cur_master);
$cur_standby->append_conf(
'postgresql.conf', qq(
recovery_target_timeline='latest'
));
$cur_standby->start;
###############################################################################
@ -267,10 +263,6 @@ is($psql_out, '1',
# restart old master as new standby
$cur_standby->enable_streaming($cur_master);
$cur_standby->append_conf(
'postgresql.conf', qq(
recovery_target_timeline='latest'
));
$cur_standby->start;
$cur_master->psql('postgres', "COMMIT PREPARED 'xact_009_11'");
@ -307,10 +299,6 @@ is($psql_out, '1',
# restart old master as new standby
$cur_standby->enable_streaming($cur_master);
$cur_standby->append_conf(
'postgresql.conf', qq(
recovery_target_timeline='latest'
));
$cur_standby->start;
$cur_master->psql('postgres', "COMMIT PREPARED 'xact_009_12'");

12
src/test/recovery/t/012_subtransactions.pl
View File

@ -119,10 +119,6 @@ is($psql_out, '8128', "Visible");
# restore state
($node_master, $node_standby) = ($node_standby, $node_master);
$node_standby->enable_streaming($node_master);
$node_standby->append_conf(
'postgresql.conf', qq(
recovery_target_timeline='latest'
));
$node_standby->start;
$node_standby->psql(
'postgres',
@ -170,10 +166,6 @@ is($psql_out, '-1', "Not visible");
# restore state
($node_master, $node_standby) = ($node_standby, $node_master);
$node_standby->enable_streaming($node_master);
$node_standby->append_conf(
'postgresql.conf', qq(
recovery_target_timeline='latest'
));
$node_standby->start;
$psql_rc = $node_master->psql('postgres', "COMMIT PREPARED 'xact_012_1'");
is($psql_rc, '0',
@ -211,10 +203,6 @@ is($psql_out, '-1', "Not visible");
# restore state
($node_master, $node_standby) = ($node_standby, $node_master);
$node_standby->enable_streaming($node_master);
$node_standby->append_conf(
'postgresql.conf', qq(
recovery_target_timeline='latest'
));
$node_standby->start;
$psql_rc = $node_master->psql('postgres', "ROLLBACK PREPARED 'xact_012_1'");
is($psql_rc, '0',